Legend missing in ScorecardMonitoring.psi_plot()

[gollolino]

When a PSI plot is generated using the function ScorecardMonitoring.psi_plot() the result is different, depdending on the choice of option savefig.

• If the figure is displayed, e.g., in a jupyter notebook using the option savefig=None it contains a legend.
• If the figure is saved to disk using the option savefig='Path/For/Figure.jpg' the legend is missing.

A fix I used was to set plt.tight_layout() before saving the plot to disk.

In my opinion it's desirable that both options for the function produce the same output. The variant with the legend is more illustrative.